Ronald Reagan’s not-so-conservative daughter Patti Davis is no lesbian — she just writes in the first person as one in her new book, “Till Human Voices Wake Us.” Davis — who posed for Playboy at age 41, appeared in the movie “Celebrity Video Centerfold” and dated Bernie Leadon of the Eagles — self-published the romantic novel on Amazon, where it can be downloaded for $2.99. The story is about a woman who falls in love with her sister-in-law. But Davis told The Post’s Richard Johnson that, unlike her other books, “This is not me. None of it is autobiographical.” And don’t expect Jackie Collins-type sex scenes. “I didn’t want to write ‘Fifty Shades of’ whatever,” Davis said. “It’s a love story.” In one passage, Davis wrote: “She knew my body long before she ‘knew’ it in the biblical sense. She stood beside me as I studied my naked self in a full-length mirror a week after giving birth to Nathan. ‘Oh my God,’ I moaned, lifting up the loose skin across my abdomen. ‘I’m a bloodhound.’ ” Love conquers all.